Fixing Issue7399 - Fixing an example of urllib usage.

Doc/tutorial/stdlib.rst

@@ -152,6 +152,7 @@ from urls and :mod:`smtplib` for sending mail::
 
    >>> from urllib.request import urlopen
    >>> for line in urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl'):
+   ...     line = line.decode('utf-8')  # Decoding the binary data to text.
    ...     if 'EST' in line or 'EDT' in line:  # look for Eastern Time
    ...         print(line)